HALFTONING
First Claim
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1. A computer-implemented method of generating a pattern of thresholds for halftone printing of an image, the method comprising:
- using a quasicrystal function which relates the positions of pixels in the image to the halftone threshold value to be used.
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Abstract
An example computer-implemented method of generating a pattern of thresholds for halftone printing of an image is disclosed. The halftone pattern is generated by an analytical computation of threshold values in-situ using a quasicrystal function. Each halftone pattern produced is non-periodic yet possesses ordered character where the pattern does not line up perfectly with a shifted copy of itself. The generation of such halftone patterns is suited to applications where a single halftone threshold value may be used per pixel.
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15 Claims
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1. A computer-implemented method of generating a pattern of thresholds for halftone printing of an image, the method comprising:
using a quasicrystal function which relates the positions of pixels in the image to the halftone threshold value to be used. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A print processor for producing a quasicrystal print output comprising:
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receiving image data indicative of an image to be printed; using a quasicrystal function which relates the positions of pixels in the image to the halftone threshold value to be used at each pixel position of the image data; and comparing each pixel value with the corresponding threshold.
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- 13. A computer program which, when executed by a processing system, causes the processing system to generate a pattern of thresholds for halftone printing of an image using a quasicrystal function which relates the positions of pixels in the image to the halftone threshold value to be used.
Specification